Introducing 20SWITCHINCH - 26" to 27.5" Conversion Kit

Apr 1, 2014
by DMR Bikes  
The latest dilemma for all of us is 26” or 27.5” wheel size. Can’t decide? Want to try them both without spending loads of money on a new frame & wheels etc? At DMR we've found a solution.

The difference in radius between the two sizes is about 12.5mm, so we’ve been testing prototypes of a rim bed spacer that fits a bit like a tire onto the 26” rim and increases the diameter to the 27.5 tire seat diameter and provides a new rim profile on top. Working name is the DMR 20switchinch and it has a rigid outer rim with the flexible ‘liner’ fitting bed that is mechanically locked to the ‘receiver’ rim & also further clamped by air pressure (actually a significant amount of force is exerted over the area around the circumference).

Fit the 20switchinch, fit new tires and tubes and providing your frame and fork has clearance for 27.5 tires you are good to go. Naturally the system is for Disc brake use only. We’ve been testing on a couple of widths and it will work over a tolerance of 4mm - inner rim width of 19 - 23mm. The prototype system adds about 200 grams per wheel, but we expect to save up to 70 grams on the production version. The floor of the 27.5 rim bed is tubeless ready with the bead hook feature built in.

Testing so far has been going well with Olly Wilkins riding DH in Madeira.

Still early days but we are hoping to have it available later this summer for around £27.50 each.

We are also prototyping a 27.5” to 29” and a “narrow to fat bike” version, but we are not convinced on the size of this future market yet.


  • 138 1
 Now I want a spacer to go from 29 to 27.5.
  • 71 1
 I think Specialized can make it...
  • 14 184
flag tobiusmaximum (Apr 1, 2014 at 3:16) (Below Threshold)
 How can you make a spacer to go down a size?
  • 7 0
 Tubeless compatible?
  • 7 138
flag tobiusmaximum (Apr 1, 2014 at 5:15) (Below Threshold)
 15 negative props because he wants a spacer to do the opposite of what a spacer does?! And if someone suggests 'you know what he means'... Then please read the bottom of the article.... 'we are prototyping a 27.5 to 29'. Jokers.
  • 60 2
 You sir... are a fool.
  • 13 120
flag tobiusmaximum (Apr 1, 2014 at 5:24) (Below Threshold)
 When did I say I thought it was a real product? Wink you sir, are presumptuous.
  • 43 4
 I was referring to you not understanding a pretty obvious joke… But I still maintain you are a fool. Wink
  • 17 1
 Make a tire that can inflate to three sizes instead.
  • 6 125
flag tobiusmaximum (Apr 1, 2014 at 5:43) (Below Threshold)
 Pretty obvious joke? You've obviously not been here long lad, pinkbike is littered with jokes that aren't funny and stupidity that imitates comedy so I presume nothing. Final note.... The thing about smart people is they seem like crazy people to dumb people - anon.
  • 42 0
 Joke gets +36, you get -21. I'd say it's pretty obvious. Smile
  • 48 0
 poor tobius, every day is Fool's Day.
  • 1 108
flag tobiusmaximum (Apr 1, 2014 at 6:15) (Below Threshold)
 What's obvious is that people arrive, see the top comment with loads of props and know its a joke. Guess I was too early to be a sheep because it didn't have 36 props. Go down the thread, there is stupidity in there that looks like a joke, how is it not an obvious joke? Plus obvious jokes tend to be funny.
  • 26 0
 Get over it!
  • 4 105
flag tobiusmaximum (Apr 1, 2014 at 6:26) (Below Threshold)
 Given the dumbing down of society and the sort of comedy that is popular these days, it is simply apparent that saying something stupid that doesn't make sense gets a laugh. Pretending to be stupid basically. We've been trained to find stupid amusing. Shall we get laurel and hardy back? They used to hit each other with ladders and stuff. Hilarious, if you're an amoeba..
  • 21 1
 "Plus obvious jokes tend to be funny"... You are obviously a joke, yet not at all funny. But your skinny jeans are!
  • 7 0
  • 18 0
 What is stupid is that you're willing to keep on arguing! Just take a bow.
  • 1 89
flag tobiusmaximum (Apr 1, 2014 at 6:38) (Below Threshold)
 Ooh it's you deadtime, priceless, where are these skinny jeans? Or have you bought me some?
  • 16 0
 lol, philosophical replies, met with rips about skinny jeans. ahh pinkbike.
  • 1 84
flag tobiusmaximum (Apr 1, 2014 at 6:42) (Below Threshold)
 Yeah, skinny jeans I don't even have no less! And gspot, it takes two bud... Are you still here?
  • 23 0
 Yes, I'm not saying I'm not arguing, I'm just saying you should probably stop.
  • 2 92
flag tobiusmaximum (Apr 1, 2014 at 6:44) (Below Threshold)
 Oh right, that makes perfect sense. You should get a job directing American foreign policy.
  • 33 0
 I'm trying to save you from embarrasing yourself further... Enjoy the thread, I'll leave you to it Smile
  • 3 85
flag tobiusmaximum (Apr 1, 2014 at 7:02) (Below Threshold)
 Oh David, I just don't know where I stand with you, first I'm a fool and now you want to save me, I'm an emotional wreck.
  • 27 0
 @tobiusmaximum, just stop. You've lost, no sense in dragging it out.
  • 16 0
 pubs don't close in the uk, right? beer yourself. let it go. relax.
  • 7 0
 Silly inoffensive humour is great... Until someone misses it. Frown
  • 3 74
flag tobiusmaximum (Apr 1, 2014 at 7:57) (Below Threshold)
 That's fine, but my point, as I reitterate, is that it was disguised as pure stupidity, which there is an awful lot of these days. And since text doesn't come with a tone of voice I shall forgive myself
  • 16 0
 fuck sake man, end it
  • 2 1
 tobiusmaximum, you is a popt'y head
  • 10 0
 Totally forgot there was englishmen reading this site, I swear I'll stop making jokes you can't understand !
  • 12 0
 Haa this little thread was quite entertaining Big Grin
  • 2 0
 @jisse hahaha, 'englishmen', good banter!
  • 4 0
 Jesse, please don't brand us all the same as tobius. I know he's not a good advert for us
  • 13 1
 Tobiusmaximum just to let you know your combine down prop count at this point is -523 great job!!
  • 5 0
 all for an april fools article! ate it up hook line and sinker and then had an internet fight about it! epic proportions
  • 3 1
 there's always one isn't there? im too mature for this sort of nonsense
  • 2 0
 I think we found a new protor in this comment section
  • 18 0
 My favourite part about April Fools day on Pinkbike is reading all the "Below Threshold" comments.
  • 2 1
 that guy is a complete idiot haha he just needs to know when to shut up and keep his opinions to him self haha
  • 2 0
 Tobias just blue himself a big one.
  • 1 0
 Tobias - 750, does he still think hes right?
  • 1 0
 and I read this... fuck!
  • 45 1
 april fools anyone
  • 2 0
  • 33 0
 it's enduro specific guys
  • 3 0
 You beat me to it.
  • 17 1
 My tyres are rubber so they should stretch right?
  • 39 0
 Yup. I run 20" holy rollers on my 29er. Keeps the weight down quite nicely :3
  • 14 0
 They got me for a few seconds, wondering how the hell that would hold up.. Nice one.
  • 3 0
 Haha same here. Until I saw the second picture that said 'enduro specific'
  • 10 0
 Surprised there has been no article today about the prototype 28.1/4" bike to fill the gap between XC and Enduro!
  • 7 1
 I'm thinking this is an April fools joke but not as good as the one on NSMB
Cane Creek Plugs the Market with Energy Suppositories They call it market penetration. LoL
  • 6 0
 Thanks a lot guys! Semi hot coffee has come out of my nose and I've had to clean it off my lap top. However, you can't put a price on laughter.
  • 15 0
 but pinkbike users would still think its too expensive!
  • 11 0
 i think CRC has a deal on it at the moment...
  • 6 1
 Should have named it "Columbus ring" , the price is a straight giveaway that this is a joke, way toooooooooo cheap for a enduro specific product & no carbon.
  • 5 0
 "We are also prototyping a 27.5” to 29” and a “narrow to fat bike” version, but we are not convinced on the size of this future market yet'

  • 7 1
 i'm.... just.... dumbfounded.... april... 1
  • 5 0
 Why's it only come in red, yellow, or pink?! Where is my neon monster piss green?! I need it to match my racing PJ's!
  • 3 0
 a good idea anyway!!!!!! if you damage the outer ring, you dont have to replace the whole rim i would buy it and ride dh with a super light wheelset and 20SWITCHINCH
  • 2 0
 Must have been April Fools today, cause I installed the cluster on the wrong way, now my gears change up when I want them to change down :-( , it will all okay by tomorrow :-)
  • 5 0
 I wish all the 27,5 crap would be just April Fools's big joke
  • 1 0
 "Enduro specific." Methinks the latter jargon will eventually become a industry-wide joke. I think I will craft a sicker that says, "Downhill Specific" and slap it on my downhill bicycle.
  • 3 0
 Nup still Penny Farthing for LIFE!!!
  • 3 0
 Good one. Almost believable.
  • 3 0
 Hows the weather Olly? It's rainin sideways!
  • 3 0
 I'm having a hard time telling the April Fools posts from the real ones...
  • 1 0
 Hahahahaha, I was really hapy that I can use my crosmaxx 26 in a 27 frame hahahaha buuuuuuuuuuu buuuuuuuuuuu buuuuuuuuuuuuuuuuuuuu Frown Frown Frown
  • 2 0
 This is one of those ideas that you look at and think why didn't I think of that.
  • 4 1
 Get a wheel spacer and be a dick about it...
  • 3 0
 But will it convert to 559?
  • 1 0
 Did someone else (Easton/Syncros maybe?) do this a previous year, trolling of the highest order Big Grin
  • 2 0
 Wanabe 27,5 pimp my 26er!
  • 2 0
 "Available in Yellow/Pink"... Nice one!
  • 2 0
 So funny. Couldn't imagine trying to git this on. Never mind hold a tire.
  • 2 0
 one of the most hilarious april fool I've found today ! thanks Pb !
  • 1 0
 Narrow to fat converter.... Clearly april fools on that alone. My frame barely takes my kendas as it is.
  • 1 0
 I told all of you that big wheel is here to stay
_____o^o_____O^O_____its faster and funer Ja Ja.
  • 1 0
 Why yes, I would love to add 500g of rotating mass to my wheels! Such momentum. So Enduro.
  • 2 0
 Hahahaha amazing!
  • 1 0
 Awh you got me, well played
  • 2 0
 Obvious April fools.....
  • 1 0 bait tastes so good.
  • 2 0
 Hahaha, april fools
  • 1 0
 goooooooooooooooood aprils fool!
  • 1 0
 obvious april fool come on guys
  • 1 0
 Lmao good April fools joke here!
  • 3 3
 I would like to keep stick on 26...
  • 1 1
 this has to be a f@cking joke!
  • 1 0
  • 1 0
 Looks flexy...
  • 1 2
 i actually wish this was real then yo ucould run carbon rims on dh and not have to worry about cracks and what not
  • 1 3
Is there and adaptor for the industry so it can stop showing new stuff each day?
  • 2 2
 April Fool's Day !!!
  • 2 3
 APRIL FOOLS' !!!!!!!!!!!!
  • 2 4
 Nice try PB!
  • 2 4
 This has to be a joke
  • 1 4
 Lame, failed attempt on April Fools Day!
  • 1 4
 i know its April fools but its really not a bad idea
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